lista_1 = [1, 2, 3, 2, 4, 5, 4, 5, 5, 1, 3]

lista_2 = [x for x in set(lista_1)]

print lista_2

s1={'A', 'B', 'C', 'D', 'E'}
s2={'A', 'B'}

print s1 & s2, s1 ^ s2, s1 | s2
print s1 < s2, s1 - s2

print s1.union(s2), s1.intersection(s2)
